Lid or end of containers made of cardboard or like material



y 1936- H, G. w. HOSKING 2,049,379

LID OR END OF CONTAINERS MADE OF CARDBOARD 0R LIKE MATERIAL Filed Nov. 20, 1935 5 Fig, 1. 4 ll HHHHILIIHIIIHIHIIII] 3 8y ffml.

Patented in, 2a, 1936 I PATENT OFFICE LID B END OF CONTAINERS MADE OF CARDBOARD 0R LIKE MATERIAL Henry Geom William Hosting; Wellington, England Application November 20. 1935, Serial No. 50,150 In Great Britain September 5, 1934 6 Claims. (01. 229-43) The present invention relates to improvements in cylindrical containers made of cardboard or a like material and provided with a push-in dishshaped lid held by friction in the container and 6 formed with a substantially horizontal flange resting upon the top edge of the container and a cylindrical flange which fits tightly the inner surface of the container. The lid is usually made of thin tin plate.

The object of the invention is to improve the frictional grip of the cylindrical or substantially cylindrical portion of the lid upon the inner wall of the container for the purpose of improving the tightness or security of the joint. This object is attained according to the invention by gnurling the cylindrical portion of the lid. The knurling increases the friction between the lid and the inner wall of the container, as the knurled portion bites into or flrmly adheres to 20 the inner wall. The improved-grip is due partly to the roughing of the surface of the lid and partly to the fact that owing to the knurling the cylindrical wall of the lid becomes more resilient, so that it is compressed when the lid is pushed in and is held with a resilient pressure against the inner wall of the container. The knurling may be applied so that it does not extend right down to the bottom of the lid, there remaining a short smooth strip between the lower edge of the knurled portion and the bottom which serves as a lead in, being of a very slightly smaller diameter. The knurl may be also so produced that it increases in depth upwardly within the knurled cylindrical portion of the lid, the result being that the outer surface of the knurled portion slightly tapers downwards so that in effect the cylindrical portion of the lid becomes, after the knurling, very slightly conical.

If desired, the lid can be made with a very slight conical inner flange instead of a cylindrical flange and in that case the knurl is produced as before either upon the whole flange or only upon the middle portion thereof, and it may be either 45 uniform in depth, or the depth of the knurl may decrease downwardly.

The knurl may be produced in any suitable or known manner, for instance by means of a knurling wheel. The knurl may be of the usual 50 straight type, that is, the depressions and projections running axially, that is, parallel to the longitudinal axis of the container.

The knurl may also be made so that the depressions and ridges are at a slight angle to the 55 vertical, and are therefore of helical shape. A

helical knurl is particularly suitable for comparatively large containers and comparatively deep lids. When a helical knurl is used, it is advisable to turn the lid slightly whilst pushing it into the container so that the lid is screwed into the container and there is no tendency for the helical knurl to be damaged or deformed during the insertion. In order to facilitate insertion of a helically knurled lid into the smooth walled container, it is advisable to place the container upon a rotatable support so that during the insertion of the lid into the container by axially applied pressure, the container can easily turn about its, axis in accordance with the pitch of the knurl. 1

It is preferred to use carboard containers made of spirally wound cardboard, as such containers have a truly cylindrical inner wall, which, in co-operation with the knurled surface of the disulligshaped lid produces a very tight and safe jo The invention is alsoapplicable to lids made I of the material known under the trade mark bakelite" or like material.

It will be understood that the improved 1m may be either removable or a permanent lid or bottom portion of the container, and it may be either solid or may have a perforated bottom portion to be used in connection with containers used as sprinklers.

The accompanying drawing shows by way of eiiziample several constructions of the improved Fig. 1 is a sectional elevation of a container and one construction of the improved lid.

Fig. 2 shows a second construction of the lid in elevation,

Fig. 3 a third construction,

Fig. 4 a fourth construction,

Fig. 5 is a sectional elevation of a portion of the improved lid according to Fig. 1, and

Fig. 6 is a sectional elevation of an improved lid according to Fig. 1 in which the depth of the knurl decreases in the downward direction. 45

Referring to the accompanying drawing l indicates a container made of cardboard and 2 indicates as a whole a push-in dish-shaped lid having a substantially horizontal flange 3 resting upon the top edge of the container, and a substantially cylindrical flange designated as a whole by the numeral 4 which fits tightly the inner surface of the container. The cylindrical flange 4 is knurled upon a portion 5, the portion 6 adjacent to the flange 3, and the lowest portion 1 adjects beyond the portions I and I, the portion I serving as a lead-in. In the construction according to Fig. 6 the depth of the knurl decreases downwardly so that a slightly conical shape is obtained, the portion 5 merging into the portion 1 gradually.

The knurl may be of the usual straight type indicated by the numeral 8 in Pig. 1 and I in Fig. 6. Fig. 2 shows a substantially helical knurl l0. Fig. 3 shows a knurl Ii similar to the knurl i0 shown in Fig. 2 except that the pitch angle varies from a minimum to a maximum, and Fig. 4 shows a knurl I! in which the pitch angle considerably increases towards the bottom of the lid.

I claim:

1. In combination with a cylindrical container made of cardboard or like material, a removable and replaceable push-in dish-shaped lid made of metal, which is provided with a stop flange and a knurled surface therebeneath in frictional engagement with the inner wall of the container, for the purpose of improving the frictional grip of the lid upon the inner wall of the container, substantially as described.

2. In combination with a cylindrical container made of cardboard or like material, a removable and replaceable push-in dish-shaped lid made of metal and provided with a stop flange and a knurled surface therebeneath in frictional engagement with the inner wall of the container, for the purpose of improving the frictional grip of the lid upon the inner wall of the container, the knurled surface not extending right down to the bottom of the lid, there remaining a smooth strip between the lower edge of the knurled por-' tion and the bottom of the lid of smaller outside diameter than the outside diameter of the knurled portion, said smooth strip serving as a lead-in.

8. In combination with a cylindrical container made of cardboard or like material, a removable and replaceable push-in dish-shaped lid made of metal, which is provided with a stop flange and a knurled surface therebetween in frictional en- 5 gagement with the inner wall of the container, for the P po e of improving the frictional grip of the lid upon the inner wall of the container, the depth of the knurl d g downwardly.

4. In combination with a cylindrical container made of cardboard or like material, a removable and replaceable push-in dish-shaped lid made of metal, which is provided with a stop flange and a knurled surface therebeneath in frictional engagement with the inner wall of the container, for the purpose of improving the frictional grip of the lid upon the inner wall of the container, the lines of the knurl running substantially parallel to the axis of the container.

5. Incombination with a cylindrical container 20 made of cardboard or like material, a removable and replaceable push-in dish-shaped lid made of metal, which is provided with a stop flange and a knurled surface therebeneath in frictional ensasement with the inner wall of the container 25 for the purpose of improving the frictional grip of the lid upon the inner wall of the container, the lines of the knurl being substantially helical.

6. In combination with a cylindrical container made of cardboard or like material, a removable an and replaceable push-in dish-shaped lid made of metal, which is provided with a stop flange and a knurled surface therebeneath in frictional engagement with the inner wall of the container for the purpose of improving the frictional grip 35 of the lid upon the inner wall of the container, the lines of the knurl being helical and of variable pitch angle, the pitch angle increasing towards the bottom of the lid. 

